You need a program that supports OpenType features like Adobe Illustrator CS, Adobe Indesign & CorelDraw X6-X7, Microsoft Word 2010 or later to enable OpenType features (ligatures and alternates).
In this case don’t install all files that we’ve provided, just need one OTF file.

Please install all TTF files

You should install all of TTF files in case you don’t have the programs that support OpenType features, so you can access all Mujaerald’s characters in almost all text processing program (Photoshop, CorelDraw etc).